SU906512A1 - Device for registering frequency characteristics - Google Patents

Description

The invention relates to medical equipment, namely to dentistry, otolaryngology, and can be used for a comparative assessment of the characteristics of the resonant cavities of the speech tract in normal and pathological conditions. ⁵ A device is known for recording frequency characteristics, comprising a series-connected sweep generator, an audio signal generator and an emitter of sound vibrations, a sound vibration receiver and serially connected, a resonant amplifier and a recording device flj. _Js

However, the known device does not allow registering the frequency characteristics of the resonant cavities of the mouth and nasopharynx, which makes it difficult to control pathological changes in articulatory organs, as well as the treatment of speech pathology.

• The purpose of the invention is the registration of frequency characteristics

.. . / resonant oral cavity and nasopharynx.

This goal is achieved by the fact that in the device for recording frequency characteristics, comprising a series-connected sweep generator, an audio signal generator and an emitter of sound vibrations, a sound vibration detector and a series-connected resonant amplifier and a recording device, a sound emitter and a sound vibration receiver are housed in a housing made of soundproofing material, divided by a soundproofing partition into a transmitting and receiving cavity, exit s which form the mouthpiece and the sound vibrations between the receiver and a difference amplifier includes series-connected amplitude detector and a peak detector circuit with a memory, wherein the second input of the differential amplifier is connected with the output of the amplitude neposredst3 detektofig. .1 depicts a structural device for registering vein ra.

In the frequency response diagram, ’in FIG. 2 of the voltage plot.

The device comprises a series-connected sweep generator 1, a sound frequency signal generator 2 and a sound vibration emitter 3, as well as a sound vibration receiver 4 and a series-connected amplitude detector 5, a peak detector 6 with a memory circuit, a difference amplifier 7 and a recording device 8. The emitter 3 and the receiver 4 of sound vibrations are placed in the housing 9, made of soundproofing material, separated by a soundproofing partition 10 into the transmitting and receiving cavities 11 and 12, respectively. Moreover, the outputs of the cavities 11 and 12 form a mouthpiece, the drive of the amplitude detector 5 is connected in parallel to the inputs of the peak detector 6 and amplifier 7 _f · θ, the output of the peak detector 6 is connected to the second input of the amplifier 7 ·

The device operates as follows.

The sweep generator 1 generates an exponentially varying voltage, which is applied to the control input of the sound frequency generator 2. Generator 2 generates sinusoidal waveforms; the frequency is supplied by the voltage at its input. The output signals are sent to the sound guide emitted in the transmitting cavity 11 and converting the electrical signals into acoustic ones. Acoustic signals through the transmitting cavity 11 enter the oral cavity or nose. Depending on the state of the resonators, an acoustic sinusoidal signal whose frequency varies exponentially receives certain amplifications and attenuations at different frequencies of the speech range. This signal through the receiving cavity 12 is supplied to the receiver 4, which converts the acoustic signal into an electric one. The electrical signal from the output of the receiver 4 is fed to an amplitude detector 5. The detected signal is fed to a peak which is driven by a control oscillator 2

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906512 4 detector 6 with a memory circuit. The signal values at the maximum points are remembered by the peak detector memory for a given time. The signal from the output of the detector 5 and the signal from the output of the detector 6 are fed to the input of the differential amplifier 7, the output signal of which is a function ДА ^ '= ~ к- f (С%), where Q- is the quality factor of the формth formant, and k is the gain . The signal ΔΑ ^ 'from the output of the differential amplifier 7 is fed to a recording device 8, where it is recorded in the form of triangular pulses whose amplitude is inversely proportional to the quality factor of the signal response formants.

Thus, the characteristics of the resonant cavities of the vocal tract are assessed by the quality factor of the first formant (the first pole of the transfer characteristic of the vocal tract). Using a swipp generator, a signal is generated proportional to the transmission coefficient of the speech path (Fig. 2a), which is fed to a peak detector with memory for a time T. At the output of the peak detector, there is a puff for the time of the first maximum, the transfer characteristic of the speech path (Fig. 26), since it is always in real speech the largest among all maxima of the speech path transmission coefficient.

Further, the signals formed in this way. (Fig. 2A and 26), are fed to the corresponding inputs of the difference amplifier, the output of which is formed by a signal (Fig. 2B). A useful signal is a positive pulse, which is emitted by the recording device (Fig. 2d). As follows from the diagrams of stresses, the amplitude of the pulse with increasing quality factor (dashed line) increases.

Thus, the device provides registration of the characteristics of the resonant oral cavity and nasopharynx, providing control of pathological changes in articulatory organs, as well as the treatment of speech pathology.

Claims (1)

1. Arvin GI et al. Installation for removing comparative characteristics of phonendoscopes. - Medical equipment, 1967, f 1, p. ij3-8. eight but Phy.